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Roman numerals/Decode: Difference between revisions
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rom2d 'MMVIII'
2008</lang>
=={{header|Java}}==
<lang java>public class Roman{
private static int decodeSingle(char letter){
switch(letter){
case 'M': return 1000;
case 'D': return 500;
case 'C': return 100;
case 'L': return 50;
case 'X': return 10;
case 'V': return 5;
case 'I': return 1;
default: return 0;
}
}
public static int decode(String roman){
int result = 0;
String uRoman = roman.toUpperCase(); //case-insensitive
for(int i = 0;i < uRoman.length() - 1;i++){//loop over all but the last character
//if this character has a lower value than the next character
if(decodeSingle(uRoman.charAt(i)) < decodeSingle(uRoman.charAt(i + 1))){
//subtract it
result -= decodeSingle(uRoman.charAt(i));
}else{
//add it
result += decodeSingle(uRoman.charAt(i));
}
}
//decode the last character, which is always added
result += decodeSingle(uRoman.charAt(uRoman.length()-1));
return result;
}
public static void main(String[] args){
System.out.println(decode("MCMXC")); //1990
System.out.println(decode("MMVIII")); //2008
System.out.println(decode("MDCLXVI")); //1666
}
}</lang>
Output:
<pre>1990
2008
1666</pre>
=={{header|Zsh}}==
<lang zsh>function parseroman () {
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